Measurement of the Collins and Sivers asymmetries on transversely polarised protons

Details Measurement of the Collins and Sivers asymmetries on transversely polarised protons Measurement of the Collins and Sivers asymmetries on transversely polarised protons

2010-05-31

arxiv.org/abs/1005.5609v1

Physics

High Energy Physics

High Energy Physics - Experiment

9 Pages, 5 figures

Scientific paper

The Collins and Sivers asymmetries for charged hadrons produced in deeply inelastic scattering on transversely polarised protons have been extracted from the data collected in 2007 with the CERN SPS muon beam tuned at 160 GeV/c. At large values of the Bjorken x variable non-zero Collins asymmetries are observed both for positive and negative hadrons while the Sivers asymmetry for positive hadrons is slightly positive over almost all the measured x range. These results nicely support the present theoretical interpretation of these asymmetries, in terms of leading-twist quark distribution and fragmentation functions.

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